Hello, I am working on a project regarding truss analysis on a plane and I need to find all the forces acting on the truss in order to produce static equilibrium (note that I have not yet taken fluid mechanics and I wanted a challenge). From what I have found, propeller thrust is: Thrust = Mass airflow X (slipstream velocity-aircraft velocity). The aircraft is moving at a true airspeed of 120km/h. Do you guys have any idea how to calculate mass airflow and slipstream velocity with these variables? The propeller being used is this: http://en.wikipedia.org/wiki/Bristol_Pegasus Thank you.